Instrument for adjusting ti-ie



F@ ffm if@ 5/ r. 5mm

AM. PHOTD-LITHO. G0. N.Y. (OSBURN E'S PROCESS.)

JAMES CAMERON, OF PHILADELPHIA, PENNSYLVANIA.

INSTRUMENT EOE ADJUsTING THE dR'INDING-SUEEACE 0E ARTIFICIAL TEETH.

Specification of Letters Patent. No. 1,574, dated Api-i1 30, 1840;

To all 'whom t may concern.'

.Be it known that I, JAMES CAMERON, of Philadelphia, in the countyof Philadelphia, in the Commonwealth of Pennsylvania, have invented a new and improved instrument for adjusting artificial teeth, so as to ascertain when their grinding-surfaces tit properly together and if they do not fit to 'show where the defects are; and I hereby declare that the following is a full and eX- actndescription of the same.

Two plates A, and B, are attached to a perpendicular rod C, resting upon the stand D; the upper plate A, being fixed to a rod E, at right angles to, attached to the perpendicular rod C, through a hole in said rod and commanded by the screw S; and the lower plate B, being attached to a movable shaft F, attached to and sliding upon the rod G; upon the upper plate A, is a nut and screw G, for the purpose of confining the impression and the teeth of the upper jaw to such plate, in order to make them stationary. Such impressions and teeth can also be confined to said pla-te by wires or screws passing through the holes l, 2, 3, in said plate, the lower plate B, moves perpendicularly upon a hinge I, attached to the horizontal shaft F, and confined to the said shaft by the nut and screw J the horizontal shaft E, is movable by sliding upon the perpendicular rod C, and may be confined to the same at pleasure by screw K. Upon the lower plate B, is a nut and screw L, for confining the impression and teeth of the lower jaw to clutch plate like the nut and screw Gr, of the upper plate A; and the said impression and teeth may be confined to the lower plate B by wires or screws passing through the holes l, 2, 3, of said plate. Upon the perpendicular rod G, is a sliding horizontal shaft M, perforated with a hole N, at the outer extremity, through which passes a wire or rod O, sliding, and coniined at pleasure by the screw P, the sliding shafts M is confined to the perpendicular rod C, by the screw 2. The upper plate A, is fixed like the upper jaw of the human head, eX- cept that it is movable at pleasure backward and forward, by means of the horizontal rod E, passing through the perpen-t dicular rod G, and also in an oblique direction on either side by the same means. 'Ihe lower plate B, is movable upon the hinge I, so as to initiate the mot-ion of the human lower jaw. The lower plate B, is also raised or depressed at pleasure by the sliding wire 0,' or by the horizontal shaft M,

the upper plate A, by the nut and screw Gr,

or by the wires or screws passing through the holes 1, 2, 3, in said plate; and the set for the lower jaw is confined to the lowerplat-e B; by the nut and screw L, or by the wires or screws passing through the holes 1, 2, 3, in said plate. The lower plate B, is then brought up by means of the strong horizontal shaft F, so that the upper and lower teeth meet; the shaft is then fastened by the screw K. The teeth are thus place-d in the same position relative to each other, that they would occupy in the human mouth. The lower plate B, can then be moved in imitation of the human lower jaw, by the hinge I, and by thus bringing the grinding surfaces of the teeth together in the same manner as they would be if in the human mouth; and then any irregularity can be discovered and remedied. Fig. l, in the drawings represent the whole instrument. Fig. 2, the casts of the teeth or impressions and Fig.V 3 represent those impressions or M for supporting the lower plate when in Y use.

3. I claim the mode of regulating the motion of t-he lower plate by means of the combined operation of the hinge I, screw J, and screw K attached to the horizontal rod F, as herein set forth.

JAMES cAMEEoN.

Witnesses: f

IsAAc BOILEAU, [1.. s] WM. R. CARPENY. [1.. s] 

